Question

已知a分之1减b分之1等于3，求分式a-2ab-b分之2a+3ab-2b的值

Answer 1

(2a+3ab-2b)/腊迟(a-2ab-b) 分轮喊李子分母同时除以ab
=(2/b+3-2/a)/(1/b-2-1/a)
=[-2(1/a-1/b)+3]/渗世[-(1/a-1/b)-2]
=(-6+3)/(-3-2)
=3/5

Answer 2

1/a-1/梁纤雀橡早b=1
b-a=ab
(2a+3ab-2b)/(a-2ab-b)
=(2a+3b-3a-2b)/(a+2a-2b-b)
=(b-a)/竖羡3(a-b)
=-1/3

追问

a分之1减b分之1等于3不是一

追答

1/a-1/b=3
b-a=3ab
(2a+3ab-2b)/(a-2ab-b)
=(3ab-6ab)/(-3ab-2ab)
=-3ab/(-5ab)
=3/5

Answer 3

∵丛游1/拦郑空a-a/b=3∴简瞎(b-a)/ab=3∴b-a=3ab∴(2a+3ab-2b)/(a-2ab-b)=[-2(b-a)+3ab]/[-(b-a)-2ab]=[-6ab+3ab]/[-3ab-2ab]=(-3ab)/(-5ab)=3/5